On Thu, 13 Aug 2015 11:45:49 -0400
Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx> wrote:
> - Switch back to using list_for_each_entry(). To fix an incorrect test
> for list NULL termination.
> - Do not assume that lists are sorted.
> - Finally, consider an existing entry to match if it consists of a subset
> of the addresses in the new entry.
>
> Cc: stable@xxxxxxxxxxxxxxx # 4.0+
> Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
> ---
> fs/nfs/pnfs_nfs.c | 33 +++++++++++++++++++--------------
> 1 file changed, 19 insertions(+), 14 deletions(-)
>
> diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c
> index cd3c0403101b..bbd407b6bc1f 100644
> --- a/fs/nfs/pnfs_nfs.c
> +++ b/fs/nfs/pnfs_nfs.c
> @@ -373,26 +373,31 @@ same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
> return false;
> }
>
> +/*
> + * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does,
> + * declare a match.
> + */
> static bool
> _same_data_server_addrs_locked(const struct list_head *dsaddrs1,
> const struct list_head *dsaddrs2)
> {
> struct nfs4_pnfs_ds_addr *da1, *da2;
> -
> - /* step through both lists, comparing as we go */
> - for (da1 = list_first_entry(dsaddrs1, typeof(*da1), da_node),
> - da2 = list_first_entry(dsaddrs2, typeof(*da2), da_node);
> - da1 != NULL && da2 != NULL;
> - da1 = list_entry(da1->da_node.next, typeof(*da1), da_node),
> - da2 = list_entry(da2->da_node.next, typeof(*da2), da_node)) {
> - if (!same_sockaddr((struct sockaddr *)&da1->da_addr,
> - (struct sockaddr *)&da2->da_addr))
> - return false;
> + struct sockaddr *sa1, *sa2;
> + bool match = false;
> +
> + list_for_each_entry(da1, dsaddrs1, da_node) {
> + sa1 = (struct sockaddr *)&da1->da_addr;
> + match = false;
> + list_for_each_entry(da2, dsaddrs2, da_node) {
> + sa2 = (struct sockaddr *)&da2->da_addr;
> + match = same_sockaddr(sa1, sa2);
> + if (match)
> + break;
Sure would be nice to consolidate some of these "same_sockaddr"
functions at some point. We also have nfs_sockaddr_cmp which does the
exact same thing, and probably some similar ones in the RPC layer.
> + }
> + if (!match)
> + break;
> }
> - if (da1 == NULL && da2 == NULL)
> - return true;
> -
> - return false;
> + return match;
> }
>
> /*
Nice catch:
Reviewed-by: Jeff Layton <jeff.layton@xxxxxxxxxxxxxxx>
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